Actually, any matter that affects our service to Jehovah or our relationship with him can be a fitting subject for prayer.
تَقُولُ :‏ « ذَاتَ يَوْمِ سَبْتٍ ،‏ صَلَّيْتُ إِلَى يَهْوَه بِشَأْنِ خِدْمَةِ ٱلْفَتْحِ بِٱلتَّحْدِيدِ .‏