What sort of thing interests you? Bondage? Pain? Anal play?
The best way to avoid getting stuck in bondage is to only cuff yourself in front, that way you can see to get yourself out if you need to.
Yep, the important thing is you can get out if you need to 
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Just to add back onto this one a personal favourite if you fancy a change to your regular masturbation routine is to lie down naked or stand up and massage your nipples (for me I like to use lube but you can use your bare fingers or whatever works for you best) only massaging them and trying to see how much pre cum you can get and also see how long you can last before giving in and reaching climax.
In my experience nipple play allows for a much more sensitive orgasm and it can be great fun including different speeds and techniques, if you’ve want to get extra kinky you can time yourself and if you give in before your target time you need to come up with a punishment. eg spanking, cock/pussy slaps, no touching for a set period of time etc etc
The main point is to explore a new erogenous zone and incorporate your other sub kinks into it if you wish.