You're young so whatever apps the young people are using would be beneficial - doubt eHarmony would be good for someone your age for instance.

I've used OkCupid with halfway decent results (I say halfway because I've dated several guys who I really enjoyed but all have been flawed - still, that may be a function of my age, lol, being in my 60's now).

As for life balance - is there a sporting activity you enjoy that is also social and involves men? That might kill 3 birds with one stone, no? I'm thinking a bicycling group, or salsa dancing, or rock climbing (or hey, if you live in/near a snowy climate, cross-country skiing - the men are buff and non-pretentious and when I tried it years ago, the ratio of men to women was super high!) Check out meetup.com for ideas?

As for grad school - be very clear on your reasons for wanting to go back. Will it significantly enhance your job satisfaction? Will it pay off in terms of dollars and cents?