Syncing bor chain failed, Looking for peers

hello guys, i am syncing bor chain, but it always shows me the following…

Sep 03 07:02:32 tianji-200 bash[8097]: INFO [09-03|07:02:32.884] Looking for peers peercount=0 tried=0 static=0
Sep 03 07:02:47 tianji-200 bash[8097]: INFO [09-03|07:02:47.884] Looking for peers peercount=0 tried=2 static=0
Sep 03 07:03:07 tianji-200 bash[8097]: INFO [09-03|07:03:07.884] Looking for peers peercount=0 tried=0 static=0
Sep 03 07:32:29 tianji-200 bash[8097]: INFO [09-03|07:32:29.466] Writing clean trie cache to disk path=/root/.bor/data/bor/triecache threads=1
Sep 03 07:32:30 tianji-200 bash[8097]: INFO [09-03|07:32:30.064] Persisted the clean trie cache path=/root/.bor/data/bor/triecache elapsed=597.700ms
Sep 03 07:32:33 tianji-200 bash[8097]: INFO [09-03|07:32:33.830] Looking for peers peercount=0 tried=0 static=0
Sep 03 07:32:48 tianji-200 bash[8097]: INFO [09-03|07:32:48.830] Looking for peers peercount=0 tried=2 static=0
Sep 03 07:33:08 tianji-200 bash[8097]: INFO [09-03|07:33:08.830] Looking for peers peercount=0 tried=0 static=0
Sep 03 08:02:33 tianji-200 bash[8097]: INFO [09-03|08:02:33.770] Looking for peers peercount=0 tried=0 static=0
Sep 03 08:02:48 tianji-200 bash[8097]: INFO [09-03|08:02:48.771] Looking for peers peercount=0 tried=2 static=0
Sep 03 08:03:08 tianji-200 bash[8097]: INFO [09-03|08:03:08.770] Looking for peers peercount=0 tried=0 static=0
Sep 03 08:32:29 tianji-200 bash[8097]: INFO [09-03|08:32:29.466] Writing clean trie cache to disk path=/root/.bor/data/bor/triecache threads=1
Sep 03 08:32:30 tianji-200 bash[8097]: INFO [09-03|08:32:30.114] Persisted the clean trie cache path=/root/.bor/data/bor/triecache elapsed=647.731ms
Sep 03 08:32:33 tianji-200 bash[8097]: INFO [09-03|08:32:33.212] Looking for peers peercount=0 tried=0 static=0
Sep 03 08:32:48 tianji-200 bash[8097]: INFO [09-03|08:32:48.213] Looking for peers peercount=0 tried=2 static=0
Sep 03 08:33:08 tianji-200 bash[8097]: INFO [09-03|08:33:08.212] Looking for peers peercount=0 tried=0 static=0
Sep 03 09:02:33 tianji-200 bash[8097]: INFO [09-03|09:02:33.665] Looking for peers peercount=0 tried=0 static=0
Sep 03 09:02:44 tianji-200 bash[8097]: INFO [09-03|09:02:44.174] Looking for peers peercount=0 tried=1 static=0
Sep 03 09:03:08 tianji-200 bash[8097]: INFO [09-03|09:03:08.666] Looking for peers peercount=0 tried=1 static=0

my ~/node/bor/start.sh file

bor --datadir $DATA_DIR
–port 30303
–http --http.addr ‘0.0.0.0’
–http.vhosts ‘
–http.corsdomain '

–http.port 8545
–ipcpath $DATA_DIR/bor.ipc
–http.api ‘eth,net,web3,txpool,bor’
–syncmode ‘full’
–networkid ‘137’
–miner.gaslimit ‘20000000’
–miner.gastarget ‘20000000’
–txpool.nolocals
–txpool.accountslots 16
–txpool.globalslots 131072
–txpool.accountqueue 64
–txpool.globalqueue 131072
–txpool.lifetime ‘1h30m0s’
–maxpeers 200
–metrics
–bootnodes “enode://0cb82b395094ee4a2915e9714894627de9ed8498fb881cec6db7c65e8b9a5bd7f2f25cc84e71e89d0947e51c76e85d0847de848c7782b13c0255247a6758178c@44.232.55.71:30303,enode://88116f4295f5a31538ae409e4d44ad40d22e44ee9342869e7d68bdec55b0f83c1530355ce8b41fbec0928a7d75a5745d528450d30aec92066ab6ba1ee351d710@159.203.9.164:30303”
–gcmode ‘archive’
–ws --ws.port 8546 --ws.addr 0.0.0.0 --ws.origins ‘*’
–pprof --pprof.port 7071 --pprof.addr ‘0.0.0.0’
–rpc.allow-unprotected-txs

does anyone can give me some help?