After that your you're looking at towing gliders
Even that's not as easy as it used to be. Since spring this year you have needed a Sailplane Towing Rating on your licence to tow a sailplane using an EASA aeroplane. Prior to then the Chief Tug Pilot at a gliding club could train you. Unless you already have the rating you need to attend a formal course to get the rating. There have been no courses run in the UK so far this year (no doubt someone can prove me wrong) although that is in the process of changing. A (very) small number of gliding clubs will be in a position to run the course shortly, including my own which hopes to have everything in place by January. (Which of couse means that at present there is a shortage of qualified tug pilots.)
To be a tug pilot requires a significant commitment in time and relatively few without gliding experience are accepted.