Consider couch surfing and Air BnB in the bigger Ethiopian cities- often young, fun, English speaking people can really show you the city from a local perspective.
Minibus transport and hitch hiking is the coolest way of transport, if you can tolerate being squeezed in a small place, and having variable times of departure (they dont leave til the minivan is “full”- varying definitions for sure).
I’d highly recommend the Tigrai Rock Hewn churches, much less touristy and more beautiful than Lalibela.
I found Harar to be the most interesting and beautiful city in Ethiopia, with incredible food (try the camel- you can buy from a butcher and have the restaurant next door cook it for you!) and beautiful winding narrow alleys. An interesting contrast and peek into the Muslim African world.
In Bahar Dar, take the local ferries (you need to wake up early to get tickets), they are beautiful, interesting and about 1/10 the cost. You will get to the lake monasteries before any tourists as well.