My dad has copd and initially pseudomonas was his usual bug. At the time he was in his mid 70's. He was treated using iv ceftazidine treatments 3xday for 2 weeks with a gap of 8 weeks between treatments.
Within 2 years the pseudomonas stopped coming up in sputum tests.
He still has infections and exacerbations but now he gets a variety of bugs popping up. Mostly he has infections of serratia mascescens which seems very hard to treat but we at least keep it suppressed. He recently developed the complication of mycobacterium infection which we tried to treat but the regime was too much for him ( tablets every day for 2 years with very harsh side effects ) That just has to remain untreated now though the 3 months he did manage to stay on it have really improved his lung health.
The pseudomonas however has never appeared again so I'd say the ceftazidine was very effective for that. For his age (83) dad is doing amazingly well and oxygen levels have been in the mid to occasional high 90's for several months now.
To me 70 sounds like you're definitely young enough to have a great chance to fight this bug with the right treatment regime and enjoy years and years of a much healthier future.
Good luck and all the best,