I'm still confused on what exactly the dealio is here for ya???
Did 'you' deposit anything? Or it it one of those PN or PStrat deals where they give you a 'free $50'? (then need to clear a bonus.. but there seems like they have variations with them. I actually took a 'free50' on PartyPoker
but I'm pretty sure they only gave me $25 & then if I deposited another $25 I'd be eligible to clear another $25 bonus... something like that. tbh I forget how it worked because I didn't even really care. I wasn't interested in clearing the bonus. I just wanted to try out the PartyPoker software at the time... so I figured "why not.... & why not try it out for free"
As far as your questions go, it's pretty hard to answer them when I still can't completely understand what you're even asking.
Should you jump up in buyin levels? Umm.. I'd say 'no' (but that'd depend obviously if you're in a time frame pinch & are looking to amass a ton of pts.).
Should you play $50-$10 sng/mtt. Umm... I'd say 'no'.. or 'why not'? (again I don't know what your goal is so I can't give a decent answer). If your goal was to try to go busto, then 'yes'.. move up to the $10's (especially if you haven't played them before). Are you a sng or mtt player? If not, then > 'no'. (seems straightforward.... no?).
Why not keep playing what you're playing? Your bankroll is too small to sustain yourself at higher limits (ie. it's not uncommon to lose 10 sng's in-a-row, even if you're Elky or Seidel, or Ivey (or 'me', lol).... or even 20 games. MTT's it's not uncommon to not cash for 30-50 game stretches.
Without knowing your goals, my answer would be > keep playing what you're playing, try to add on a few more tables (if they have more tables available on that site).