How can I get passed level 4121

Hello @jules16 and welcome to our friendly community.  Do you get the build a bot?  If you do - I would start with a full Build a bot - not only does it give you 3 extra moves - it also will give you two CBs and two stripes and wraps. I would also add a fish booster if you can.  You will need to hit the mixer as many times as you can with stripes or stripe/wraps and of course if you get a two cb combo not only will it hit the mixer, but it will also help clear the board.  What you want to do is clear the jelly under the chocolate ideally before you release the waffles - otherwise you will have a continous stream of waffles covering those jellies.

Unfortunately - you may just have to wait for that 'lucky' board.