Any lane that's losing, has to be defensive and farm as safely as they can and not, under any circumstances farm a wave past the river, especially if you don't know where the enemy champs are. I am a top lane main, and yes low elo (mostly because I don't play ranked much if at all) but from my experience if you are losing lane it is on you to do 2 things. 1: Not lose lane any harder than you currently are 2: Recognize where your team is currently winning.
If you have TP, and are losing, and your bot lane is winning; do your best to save tp to help bot lane, or use it to catch a minion wave about to crash under tower. If your opponent is a hard shoving bully, understand that you're going to feel very stomped on, and very alone in getting stomped for a while. Get the cs you can and do not engage your lane opponent. If they 2 man dive, you can try to outplay it, but if you see 3 coming (with or without herald) just fallback and let them take the tower. Don't die there and lose tower anyway and farm cs from T2 tower. That's just your life now. Allow your bot lane to continue to win hard, and snowball as your team pours resources into snowballing bot lane as the enemy dedicate their pressure to you. You're a sponge. Just soak the pressure. As long as you don't die repeatedly and are able to farm passively you'll be okay. If your minion wave is pushing out and your lane opponent isn't there, don't push with it. Roam and look to help mid lane or your team around an objective and use TP to help around an objective. You might be the little bit that's needed to turn a fight. It's not your job to push and take towers because your lane opponent can just show up and kill you because you lost lane already. It's your bot or mid lane's job to do that. Your job is to farm and join team fights. That's it.
Remember they can't snowball a top laner harder than most adc's snowball. Eventually your bot lane will take their lead and win the game with how powerful they are, if they don't, it's not your fault, you did what you could. It's just sometimes how it works. Just be patient and be a little bitch sometimes. Cuz if that prevents them from farming you for gold and taking you off the map, then that's what you got to do. Don't be a Hashinshin and die 15 times trying to be aggressive on a lane you've already lost.