If it’s suspended, your node will recover on its own after completing enough successful audits. You should know though that nodes don’t currently get suspended for being offline. It gets suspended for not responding correctly to audits. Please take a look at your log and look for lines that contain both failed and GET_AUDIT. Those should tell you what happened that caused this suspension.
" Your node has been suspended on 118UWpMCHzs6CvSgWd9BfFVjw5K9pZbJjkfZJexMtSkmKxvvAW1wFTAgs9DP5RSnCqKV1eLf6N9wtk4EAtmN5DpSxcs8EjT69tGE121RTSDpyNZVcEU84Ticf2L1ntiuUimbWgfATz21tuvgk3vzoA612EayRS2V1kEsWESU9QMRseFhdxYxKicsiFmxrsLZHeLUtdps3S12L9ZFwhzVpuEKMUNUqkaTLGzwY9G24tbiigLiXpmZWKwmcNDDs12rfG3sh9NCWiX3ivPjq2HtdLmbqCrvHVEzJubnzFzosMuawymB . If you have any questions regarding this please check our Node Operators thread on Storj forum."