This study investigates the effect of increasing fiber reinforcement amount from 1% to 2% and the changes in fly ash-based geopolymer composites' creep and shrinkage properties in compression and long-term deflection in three-point bending. For testing purposes, beam-shaped and cylindrical specimens were prepared. Specimens were reinforced with 2% PVA, 2% steel, and 1% PVA + 1% steel fiber mix. The long-term tests were performed on creep test stands. The test results show long-term flexure is reduced by 82–93%, depending on fibre type, if the amount of fibres is increased from 1% to 2%. In compression, increased fiber reinforced specimens show 52.83% and 11.39% creep strain reduction compared to specimens with low amounts of fiber reinforcement. Shrinkage strains are reduced only for specimens with 0.5% PVA and 0.5% steel fiber reinforcement by approximately 76%, while for 2% steel fiber reinforced specimens, shrinkage strains are slightly increased by 8.9%. The results show that 2% fiber inclusion into geopolymer composite reduces long-term flexure up to 14 times, especially for the specimens reinforced with 1% PVA + 1% steel fibers. In compression, creep reduction from 2% fiber inclusion has less effect, and in shrinkage, there is one occasion where shrinkage has slightly increased.