Giving my pots a bit of a boost after the winter

I am a very novice gardener, some advise please🙏, I have some planters that I left the fuchsia plants in last year, they are looking a bit twiggy but haven't died, how can I give them a bit of a boost so that they might flower again this year, liquid feed or pellets? Also seen that coffee grounds are good for plants we have ground coffee most days so I am collecting the grounds , last year I sprinkled them on some of my pots, is that ok do I need to do anything else, I have evergreen type plants and hydrangeas. Same with banana skins just cut up and put them in the earth or do I need to soak them? They went a bit furry last year when I did that. Thank you.