Sun mahadasha won’t be great. Concept of exalted planets giving good results is hollow and scratching the surface only (if that was the case all people born during 1 month of sun exaltation or ~10 days of Sun being in 1 nakshatra will have good results).
Sun is 6th house lord placed in first house in Chalit in nakshatra of Venus and has Venus as sublord. Venus is most malefic planet for pisces lagna and Sun is showing combination of 1,3,6,8 which is bad for health or career.
Do your efforts and improve your present vs worrying about future.