Dear SkyTeam gurus - looking for a FF program recommendation. I do have an account with Delta Skymiles (33K "never expiring" miles, regular member), but I will primarily start commuting on Aeroflot starting next week. This will be BRU<->SVO every two weeks for the next year. Wondering how to achieve elite status with the main criteria below. Thanks for any suggestions!

1. What is most important to you in a frequent flyer program (FFP)?
upgrades, priority services, baggage allowance, good award redemption rates, better award access, lounge access, etc.
-> Lounge access and award redemption

2. How many miles do you usually fly each year? How many flights/sectors?
less than 25000 miles, 50000+ miles and 20-25 flights, etc.
-> 12000 miles, 12-15 flights

3. What fare class do you usually buy?
first, business, premium economy, economy
-> economy

4. Are you able to choose your airlines and/or class of service? Do you travel for work and/or pleasure?
-> No

5. Which routes do you fly most often?
transatlantic, domestic USA, intra-Asia, etc.
BRU-SVO

6. What is your home airport?
BRU

7. Do you have status in any FFP? What is it? How miles do you have banked in each FFP, if any?
-> Nope

8. What are your preferred airlines, if any?
-> I used to fly star alliance primarily, but I need to start doing BRU->SVO with Aeroflot soon, so need a FF program recommendation