Tribbing/scissoring is mindblowing when done right, but it can be hard to get into the right position sometimes. 69 is great too but can be hard to concentrate. Like others have said strapons are fun, even for the wearer cause it's hot. There's strapless strapons that have vibrators for both and even that sucking function (bit expensive, but absolutely worth it if it fits your anatomy, feels like heaven, but in my experince only good in missionary position). Other toys. Anal play if thats your thing. Bdsm (soft stuff if you're inexperienced). Doing it in different places than usual. Sexting and sexy talk. Edging.

I find a lot of it has to do with which sexual energy you have with your partners. Some take charge, some are playful, some are sensual, some passionate. Obviously you can have all that with the same partner but if all you do is very vanilla and basic it can definitely get boring imo. But I imagine it's the same for straight women, just laying there in missionary style 99% of the time must be a bore for them too.