This is a tough CTF map for actually capturing flags. The long open spaces mean you’re an easy target for a decent period of time during your run back to your base.
There aren’t a lot of tricky paths you can take to quickly break line of sight and the ones that are there will dump you right onto one of the main streets. Your success on this map depends on how well you use your fundamentals and how well your team coordinates its attacks. Stay off the main roads while the flag is in your possession. Run through buildings and up the side lanes of the map. When you see an obstacle ahead, run around it and put it directly behind you to limit back attack opportunities. If your teammate has the flag, stay with them and watch their back and flank while they run the flag back to your base.
These are all very standard strategies that work for pretty much any Capture the Flag map, but the most effective strategies will be ones communicated between you and your teammates. If your team has a sniper who can hold down any of the main roads, you’ll be able to make your way back to the base much faster. Teammates running interference will prevent you from getting flanked while taking the safer route. A good defense back at your own flag will prevent ambushes upon your arrival at your base. Talk to your teammates and make the big plays happen to win this game mode on this map.